<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .box{
            width: 123px;
            height: 123px;
            border-radius:20px ;
            border: 2px solid yellowgreen;
            margin-top: 700px;
        }
    </style>
</head>
<body>
<div class="box"></div>
</body>
</html>